Families of victims of the Sept. 11, 2001, terror attacks and a 1983 bombing of U.S. Marines in Lebanon are seeking to hold Iran accountable in separate legal actions.

A lawsuit filed Monday in federal court in Manhattan seeks to enforce a $2.6 billion judgment against the Islamic Republic of Iran awarded by a federal court in Washington, D.C. That award stemmed from claims Iran was involved in an October 1983 bombing that killed 241 servicemen at a U.S. Marines facility in Beirut.

Lawyers for families of victims of the 2001 terror attacks are seeking to force the government of Iran to pay damages for supporting terrorism.

No lawyers have represented Iran in the actions.